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As air pressure in the chamber decreased, the air inside the teacakes expanded until the chocolate cracked and the mallow filling puffed out.

And in the Pacific north-west , communities are still recovering after last week's bomb cyclone, an intense weather event that takes place when air pressure quickly drops off the coast.

The "bomb cyclone" - as forecasters call it - is caused by air pressure quickly dropping off the coast, which has rapidly intensified the weather system.

Simulations with a computer model suggest that the singers can, among others, only produce their highest frequencies with a greatly increased tension in the vocal folds, supported by high expiratory air pressures.

When sinuses are functioning normally, he says, air moves freely so that the air pressure in the nose and sinuses is the same as in one’s surrounding atmosphere.